Saw-mill dog



(No Model.) 3 Sheets-Sheet 1.

W. J. F. LIDDELL.

SAW MILL DOG.

Patented Oct. 2, 1883.

(No Model.) 3" Sheets-Sheet 2.

W. J. I'. LIDDELL.

Y SAW MILL DOG. No. 285,824. l Patented Oct. 2, 1883.

'* *FULL il N. PETERS mmunmynwsr, wnnqm". u. c

(No Model.) 3 Sheets-Sheet 3.

W. J. P. LIDDELL. Y

SAW MILL DOG.

No. 285,824. Patented Oct. 2, 1883.

mmwm I hef 2@ Eff/Ven or i i/if'ey u. PETERS. rma-umgnphen mmm n n 'UNITED STATES 'PATENTv Clarion.,

WALTER- F. LIDDELL, OF CHARLOTTE, NORTH CAROLINA.

SAW-MILL. DOG.

SPECIFICATION forming part of Letters Patent No. 285,824, datei `October 2, 1,883.

l Application iiled Tune 16, 1883. (No model.)

To (LZZ whom, it mlay/ concern:

Be it known that I, W. J. F. LIDDELL, of

Charlotte, county of Mecklenburg, State of Y tion, reference being had to the accompany-V ing drawings, making part of this specification.

My invention relates to that class of mechanism which is dcsignedito hold materials upon the carriage `of a saw-mill in proper position to be operated upon by the saw; and the object of the invention is to produce a simple and efficient mechanism for the purpose stated which shall be capable of very considerable adjustment, in order to receive materials of different widths, and the several functions of which shall be performed in consequence of manipulations of a single operative member.

To the above ends my invention consists in the provision of -a mechanism in which two dogs are arranged, one above the other, within a suitable standard, theV lowerdog being attached to the lower portion of a verticalrackbar placed within the said standard in such manner as to have a limited vertical movement, and the upper dog being attached to a carrierblock, also confined within the said standard, and moving freely in a vertical plane upon the rack-bar, and an operating-lever pivoted upon said carrier-blockand engaging directly or indirectly withthe said rack-bar, for the purpose of holding thecarrierlock at any` de-- sired point of'its movement, while permitting 4the unimpeded movement of said block when so desired. l

My invention further consists in the provision of certain devices for retaining the carrier-block at the upper limit of its permitted vertical movement, and for holding the operating-lever out of engagement with the rack.- bar during the retention of the carrier-block.

My invention further consists in so arranging the upper dog that, when idle, it may be retracted so as to bring its outer end flush with the front face of the standard, for the purpose of avoiding obstruction to the board while being placed in position.

My invention further consists in certain details of construction, hereinafter described and claimed.

In order that my invention may be fully understood, I will proceed to describe it with reference to the accompanying drawings, in which- Figure l is a side elevation of my improved mechanism, the near section of thev standard being removed to expose the interior devices. Fig. 2 is a vertical longitudinal section through the base and carrier blocks, the parts being in operative position upon the rack-bar. Fig. 3 is a top view of the carrier-block and operating-lever in detached position. Fig. 4 is a side elevation of one of the sections of the standard, showing the vertical guides upon the inner side. Fig. 5 is a side elevation of one of the standard-sections, showing the manner of attaching the lever-stop. Fig. 6 is a top view of the standard, the working parts being removed, showing the suspending-bar. Fig. 7 is a side elevation of a modified form of mechanism, the near section of the standard being removed and the parts being in operative position. Fig. 8 is a vertical section of the same. Fig. 9 is a side elevation ofa modied form of standard for the mechanism shown in Fig. 8. Fig. 10 is a rear elevation of the modified carrier. Fig. Il is a horizontal lon-V gitudinal section of the modified operatinglever. Fig. 12 is a side elevation of the modifled carrier and operating-lever, showing the opposite side from that shown in Fig. 7.

In the said drawings, A designates the carriage of my improved mechanism, arranged to slide longitudinally upon suitable guide-rails,

A', and carrying upon its forward end the standard B. This standard is composed of two vertical parallel sections having eacha vertical shoulder. b, at the front edge of its outer side. On its inner sideeaoh of these sections is formed with two parallel vertical guides, b b2, the former of which extends the entire length of the section,while the latter tapers off, V

and terminates some dist-ance lower down.

C designates a rack-bar, one side of which is formed with a continued series of teeth, c, extendingfr'omitstop downwardnearly toitsbase. At the lower end of this rack-bar is formed a square enlargement or block, C,which carries the lower dog, I), to be presently described. The rack-bar C stands vertically between the two sections of the standard '15, and is held in position partly by a bolt or pin, 1,which passes ICO transversely through the sides of the standard, and also through a vertical slot, c', formed horizontally through the block. It will thus be seen that the bar C will be capable of a slight vertical movement upon the pin l equal to the difference' between the length of the slot c and the diameter of the pin l. Furthermore, the distance between the two guides bbt is sufficiently greater than the width or depth of the block to permit a slight transverse movement of the latter. The purposes of these arrangements for permitting movements of the block C will be hereinafter stated. The lower dog, D, is seated in a vertical groove, which extends throughout the length of the block, its bottom being iiush with the edge of the rack-bar, and its sides tapering off at their lower ends, as shown. A tail-piu, d, is inserted through the body of the block C', and enters the body of the dog in such manner as to be removable, so as to permit the dogvto be detached from the block.

C2 designates the carrier-block for the upper dog, D, and also for the operating-lever E, hereinafter described. This block is formed with rabbets c3, extending vertically upon its four corners, as shown, the shoulders of which play loosely between the vertical guides b b2, for a purpose hereinafter described. At its upper end this block is formed with a pro- `jecting ledge, c, which overhangs the rear side of Ythe block, and upon this ledge is formed a triangular stud, c, placed apex out, as shown, the upper side of the ledge c* being beveled off to correspond withthe slopeof the upper side ofthe stud c". At the rear face of the block- CZ is formed a recess, c6, to receive the inner end of the operating-lever E,ipresently to be described. Through the upper and lower ends of the block C2 are formed apertures opening above and below into the recess c6 and designed to receive the rack-bar C. An opening, e8, is formed horizontally through the upper part of the block C2, from front to back thereof, and constitutes the socket for the dog D. This dog is formed with a shank having an opening, d, formed centrally through it in a vertical direction, and corresponding in form and position with the upper aperture, c7, through which the rack-bar passes. of the shank are two prj ecti ons, di, in the form o f down-turned hooks, each of which is provided at its lower portion with an eye, through which passes a key, 2, resting against the rear side of the block C? when the dog is attached to said block, the arrangement being such as to permit of the detachment of the dog from the block when so desired.

3 designates a pin which passes transversely through the standard, suitable holes being formed in the sides ofthe standard to receive said pin. One end of this pin is formedwith a screwhead, while the opposite endis formed with a screw-thread, the corresponding hole of the standard being threaded internally to receive the thread of the pin. When vthe pin 3 is screwed into position, as shown, it consti,-

At the rear end tutes a brace for the upper ends of the sec tions of the standard, also the means for retaining the block C2 at the upper limit of its movement, as hereinafter described, and also the means for attaching the` stop-piece C3. This stop-piece is made of such length that, when the projecting threaded end of the pin 3 is inserted into its eye, its rear end shall rest against the shoulder b of the standard, and thus be prevented from tilting upon the pin. The piece C3 is further secured against dis placement by a nut, 3, screwed upon the threaded end of the pin 3, between which and the side of the standard the stop-piece is coniined. The opposite end of thevpieee C3 is turned at rigl'it angles, so as to extend across the face of the standard and act in connection with a spur upon the operating-lever, as hereinafter described.

E designates the operating-lever, which ma y be of an approximately S shapeas shown. At its inner end this lever is formed with a series of gear-teeth, e, and also with an eye which receives a pivot-bolt, 4, by which said lever is attached eccentrically upon the block C2. The pivot-bolt 4 is inserted through an eye formed through each oi'two lugs, c, placed upon the rear side ofthe block C2, and at either side of its recess c. Aspur, c', is formed upon one side of the lever at a point about midway of its length, for a purpose hereinafter de` scribed.

Figs. 9 to l2, inclusive, illustrate a modified form of my improved mechanism, operating on similar general principles, but somewhat differently arranged. The important distinction between the two forms here shown is that in the former the operating-lever acts directly upon the rack-bar, while in that now to be described the operating-lever acts indirectly upon the rack-bar through the medium of an interposed pinion. The modifications now to be described relate exclusively to the standard, the carrier-block, and the operating-lever, the remaining parts being identical with those previously described.v In this form one of the sections of the standard Bis formed with a long recess, b3, extending from near its top to near its bottom, for the purpose of accommodating the operating-lever connections when said lever is depressed. In this section the guide b2 is omitted, the opposite section being alone provided with said guide, and the pin 3 passes through an e`ye formed in a projection above the upper terminus of the recess b2. The carrier-block in this instance is of substantially the same form as that previously described, but is provided with certain cams, as hereinafter set forth.' The dog D in this instance is -of substantially the same form as that previously described, and is attached in the same way; but the hooks (Z3 are here dispensed with, the ledge c4, with a groove, cx, formed beneath it, and stud '65, being here alone the means for retaining the block C2 at the upper limit of its vertical movement, as hereinafter described.

IOO

IIO

' shown.

At thelower `corner of the block C2 is attached the lower end of a curved arm, F,whieh extends outwardly and upwardly, and ter1ninates at its upper end in an outwardlybent portion, j. rlhe inner side, f', of this arm inclines inwardlyfrom its upperto itslowerportion, and at the latter point a shoulder, f2, is formed on the inner side of said arm, all for purposes presently to be stated. Attheopposite lower corner of the block C? from that of the arm F is attached the lower end of a Vscc-- ond arm, G, which extends outwardly and upwardly, its upper edge being concentric with and resting against the edge of the corresponding lug, c", and at its upper end said arm is bent outward at right angles, and then downward in the form of a broad outwardly-inclined caln, g. These caius Ff f and G g act, in connection with a sliding` bar attached to the operating-lever E, in the manner and for the purposes hereinafter described. At its lower end the operating-lever E is formed with abox, H, provided at its inner end with two parallel lugs, llz., each of which has an eye formed through its'outer portion, and the under side of which is covered by a plate, hf, securely joined to the main portion of said box, as A groove, htis formed longitudinally upon the under side of said box, and a transverse recess, h, is also formed in each of its sides, near the inner ends thereof. A sliding har, I, works in the groove h2, and upon its underside is foned a groove, i, corresponding with the grooves h2. Upon its front end the bar I is formed with a set ot' geaifteeth, similarly to the teeth e, previously described. Lying within the recesses hl and the groove i is a bar, J. the ends of which are provided with oppositely-disposed oblique faeesj, `which work against the sides of the recesses h2. The lever E, with its connection, is attached pivotally to the block CZ by a pivot-bolt, 4, which passes through the eyes in the lugs e of the block, and of the lug lzy of the box H. The lugs of the box H lie each outside of those of the block C2. A` gear-pinion, K, is centered upon the pivot-bolt 4, its teeth meshing ccnl stantly with those of the rack-bar C, and en.-

gaging or disengaging at will with the teethfi" of the bar I.

The operation of my improved mechanism is as follows: The carriage A is properly adjusted longitudinally upon the guide-rails A/,

` so as to make room for the board to rest edgewise upon the ends of the rails and against the faces of the standards. The carrier-blocks C2,

which may be supposed to have beedn left resting upon the lower blocks, C, are raised to the upper limits of their movements by raising the levers E and lifting said blocks C2 up thereby. In ease the mechanism iirst described be used, the elevation of the outer ends of the levers E depresses their inner ends and movement the ledges e" and studs ci carry the blocks past the pins 3 sufficiently to bring the hooks d2 of the-dogs D' above the pins 3, the spurs c of the levers E at the same time entering between the rear faces of the standards B and the front faces of the stops Ci". Theblocks C are now tilted back upon the upper ends of the guides lf3, so as to throw the hooks di over the pins 3, after which the blocks C2 are allowed to fall, and are caught by the hooks d? upon the pins 3, whereby thei further descent is arrested, the levers Ebeing also held from falling by the spurs e', resting against the stops C3. In ease the modified form of mechanism be used, the lever is raised in the same wayas before, by which movement the wedgebars J are forced to one side by the contact of their contiguous ends with the cams g of the arms G, thereby retracting the sliding bars I and throwing the teeth fi out ofengagement with the pinions K, so that said pinions are allowed to revolve freely upon the pivotbolts 4 as the blocks C2 ascend. At the upper limits of theiry movementsthe blocks C2 ter whiehthe blocks Czare raised and tilted forward upon the upper ends of the guides b2, so as to free said blocks from the pins 3, and are allowed to descend upon the rack-bars C until the dogs D strike the upper edge of the board, the spurs c in the meantime passing downward out of contact with the stops C.

As soon as the dogs D strike the upper edge of the board, the levers E are depressed. In the arrangement first described this depression of the levers Efrst brings the teeth e into en gagementV with the teeth of the rack-bar C, then, as the levers E continue to descend, raises the rack-bar C and with it t-he blocks C,and causes the lower dogs, D, to come in contact with the under edge ofthe board, and both upper and lower dogs to bite well into the material. The inal movement of 'descent of the levers E locks the rack-bars, so as to, maintain the grip of the dogs. I n the modiyied form of mechanism the descent of the levers E first causes the wedge-bars .I to move in a direction oppositeto that of their previous move -ment by engagement of their ends with the out-turned endsj` and oblique sides f of the arms F, thereby forcing the ba-rs I inward and causing their teeth t" to engage `with the teeth e of the rack-bars C. The further descent of the levers E rotates the pinion K upon the pivots 4, raising the rack-bars C and bringing the lower dogs, l), into contact with the lower edge of the board. The final movement of descent of the levers E causes the upper and lower dogs to bite well into the board, and locks the rack-bars C, so as to maintain the grip of the dogs. At the completion of the IOO descent of the levers E the boxes II rest at their under sides upon the shoulders f? of the arms IT'. The board is now ready for sawing,

after which the levers are raised, as before and the blocks C2 are caught upon the pins 3. After the board has been removed from the machine and a new one has been placed in position, the subsequent operations above described are successivelyrepeated. form of my device it will be seen that when the carrier-blocks C'l are thus suspended upon the pins 3, the upper dogs, D', will be drawn backward within the standard to such an eX- tent as to bring their outer extremites flush with the forward faces of the standards, thereby avoiding any obstruction on the part of said dogs to the board while the latter is being placed upon the head-block. This retraction of the upper dogs is of the rst importance in devices of this sort, and the facility with which it is here accomplished renders my structure very useful and valuable in this respect also. Thus it will be seen that in either form above described my improved mechanism is simple and durable in construction; also, that it is capable of very considerable adjustment, so as to receive materials of different widths, and, also, that all of its functions are performed in consequence of manipulations of a single member--the operating-leverE. The arrangement shown in Figs. Ito 8 is that preferred by me on account of its greater simplicity over the form shown in Figs. 8 to 13. However, I here reserve to myself the right to make a separate application for Letters Patent for the modiiied form of my invention herein described.

I do not confine myself to the precise construction herein described and shown, as various modifications of such construction may be made without departing from the spirit of my invention; but,

Having now described my invention, what I claim as new isl. In a saw-mill dog, a vertical standard formed in two parallel sections having guides upon their inner faces7 and a rack-bar conined between said stand ard-sections in such manner as to have a limited vertical movement, and loosely confined at its lower end between said guides, in combination with' a dog upon the lower end of said bar to engage the under side of the board, a carrier-block mounted upon the rack-bar and movable vertically thereon, a dog upon the carrier-block to engage the upper side of the board, and an operating-lever pivote'd upon the carrier-block, and engaging at its inner end, directly or indirectly, with the rack-bar teeth, the said carrier-block being loosely confined between the said guides, and the said operating-lever extending at right angles to the face of the standard through its rear In either side, substantially as and for the purpose set forth.

2. In a saw-mill dog, a vertical standard composed of two parallel sections having guides upon their inner sides, and a rack-bar confined between said sections in such manner as to have a limited vertical movement therein, and loosely conned at its lower end between the said guides, in combination with a carrier-block confined loosely between the guides and movable vertically upon said rack-bar, a dog upon the lower end of said bar to engage the under side of the board, a dog upon the carrier-block to engage the upper side of the board, and an operating-lever pivoted upon said block, and provided at its inner end with a toothedsegment to engage, directly 0r indirectly, with the rack-bar teeth, said lever extending at right angles to the front of the standard through its rear side, substantially as and for the purpose set forth.

3. The vertical standard composed of two parallel sections having guides upon their inner faces, a rack-bar mounted within sai d stand- `ard in such manner as to have a limited vertical movement, and loosely confined at its lower end between said guides, a holding-bar secured transversely upon the upper end of said standard, and a catch projecting from the front face of said standard and mounted upon the said holding-bar, in combination with a dog upon the lower end ofthe rack-bar, a sliding carrierbloclc mounted upon the rack-bar, a dog mounted upon the block, and an operating-lever pivoted upon said block and engaging with the rack-bar teeth, the said block being arranged to engage with the holding-bar and to be held thereby at the upper limit of its vertical movement, and the lever being arranged to be held in elevated position'by the catch at the upper limit of the vertical. movement of the block, substantially as and for the purpose set forth.

4. The combination, with the vertical standard formed in two parallel sections having guidesl upon their inner sides, and the rackbar looselyconined at its lower end between said guides, and provided with the verticallyelongated slot at its lower end, of the dog mounted upon the lower end of said bar, the carrier-block vertically movable upon said rack-bar, the dog and pivoted lever mounted upon said block, and the transverse pin passing through the standard-sections and through the rack-bar slot, substantially as and for the IIO 

